Towel shelf



FIG. 1 is a front elevation view of a towel shelf in accordance with my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof, with the left side being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a front right side perspective view thereof. 

The ornamental design for a towel shelf, as shown and described. 